22218961 has 4 divisors (see below), whose sum is σ = 23388400. Its totient is φ = 21049524.

The previous prime is 22218941. The next prime is 22218997. The reversal of 22218961 is 16981222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22218961 - 2¹⁵ = 22186193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22218941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 584691 + ... + 584728.

It is an arithmetic number, because the mean of its divisors is an integer number (5847100).

Almost surely, 2^22218961 is an apocalyptic number.

It is an amenable number.

22218961 is a deficient number, since it is larger than the sum of its proper divisors (1169439).

22218961 is a wasteful number, since it uses less digits than its factorization.

22218961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169438.

The product of its digits is 3456, while the sum is 31.

The square root of 22218961 is about 4713.6992903663. The cubic root of 22218961 is about 281.1304679877.

The spelling of 22218961 in words is "twenty-two million, two hundred eighteen thousand, nine hundred sixty-one".